Causes bogus errors Rated 3 out of 5 stars

This add-on has, for several versions now, generated bogus error messages any time the Download Manager is open. It's especially annoying and constant in own-window mode, less frequent in sidebar mode and least frequent in tab mode, but it never stops. There's an entire web page about this at:
https://support.mozilla.org/en-US/questions/866588#answer-326059

It's annoying enough (long lock-ups, followed by a bogus script error message) I had to disinstall DMT, just like I did over a year ago with an earlier version. I don't know why this hasn't been fixed yet, but am guessing it's an add-on interaction problem, so not frequently observed enough to get the developer's attention or something. Have to give it a neutral review. Nice idea, but the execution has a "fatal" problem.
It's so annoying, I had to disinstall the addon, just like I did a year or so ago when I first tried it. I surmise that it doesn't happen on all systems, and thus hasn't been tracked down and fixed. It may be an interaction problem with some other

This review is for a previous version of the add-on (0.9.5).